//
//  ViewController.m
//  UI07_UIViewControllerLiftCycle
//
//  Created by Hanlingyu on 16/7/22.
//  Copyright © 2016年 ltq. All rights reserved.
//

#import "ViewController.h"
#import "FirstViewController.h"

@interface ViewController ()

@end

@implementation ViewController
#pragma mark - life Cycle

// loadView 与 viewDidLoad viewWillAppear
// 以上三个方法, UI会插在一个视图控制器上的, ViewWillDidAan
- (void)loadView {
    [super loadView];
    NSLog(@"%@ ----- %s",self.class, __FUNCTION__);
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSLog(@"%@ ----- %s",self.class, __FUNCTION__);

    
    
    self.view.backgroundColor = [UIColor redColor];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(barButtonClicked:)];
    
}
// 视图将要出现就会调用
- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];
    NSLog(@"%@ ----- %s",self.class, __FUNCTION__);

}
// 视图完全出现, 就会调用
- (void)viewDidAppear:(BOOL)animated {
    
    [super viewDidAppear:animated];
    NSLog(@"%@ ----- %s",self.class, __FUNCTION__);

}
// 视图将要消失时, 就会调用, 只有一点消失
- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    NSLog(@"%@ ----- %s",self.class, __FUNCTION__);

}
// 视图已经完全消失,就会调用
- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    NSLog(@"%@ ----- %s",self.class, __FUNCTION__);
}


- (void)barButtonClicked:(UIBarButtonItem *)buttonItem {

    FirstViewController *firstVC = [[FirstViewController alloc] init];
    [self.navigationController pushViewController:firstVC animated:YES];

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end
